<template>
  <!-- <div class="pagination" @click="getPageNo(pageNo)"> -->
  <div class="pagination" @click="$emit('getPageNo',pageNo)">
    <button :disabled="pageNo ==1" @click="$emit('getPageNo',pageNo-1)">上一页</button>
    <button v-if="startNumAndEndNum.start > 1" @click="$emit('getPageNo',1)" :class="{active:pageNo ==1}">1</button>
    <button v-if="startNumAndEndNum.start >2">···</button>

    <button
      v-for="(page, index) in startNumAndEndNum.end"
      :key="index"
      v-if="page >= startNumAndEndNum.start"
      @click="$emit('getPageNo',page)"
        :class="{active:pageNo ==page}"
    >
      {{ page }}
    </button>

    <button v-if="startNumAndEndNum.end <totalPage-1">···</button>
    <button v-if="startNumAndEndNum.end <totalPage" @click="$emit('getPageNo',totalPage)" :class="{active:pageNo ==totalPage}">{{ totalPage }}</button>
    <button :disabled="pageNo ==totalPage" @click="$emit('getPageNo',pageNo+1)">下一页</button>

    <button style="margin-left: 30px">共 {{ total }} 条</button>
  </div>
</template>
  
  <script>
export default {
  name: "Pagination",
  props: ["pageNo", "pageSize", "total", "continues"],
  computed: {
    //总页数
    totalPage() {
      return Math.ceil(this.total / this.pageSize);
    },
    //
    startNumAndEndNum() {
      const { continues, totalPage, pageNo } = this;
      let start = 0,
        end = 0;
      if (continues > totalPage) {
        start = 1;
        end = totalPage;
      } else {
        start = pageNo - parseInt(continues / 2);
        end = pageNo + parseInt(continues / 2);
        if (start < 1) {
          start = 1;
          end = continues;
        }
        if (end > totalPage) {
          end = totalPage;
          start = totalPage - continues + 1;
        }
      }
      return {start, end};
    },
  },
  methods:{
      // getPageNo(pageNo){
      //     this.$emit('getPageNo',pageNo)
      // }
  }
};
</script>
  
  <style lang="less" scoped>
.pagination {
  text-align: center;
  button {
    margin: 0 5px;
    background-color: #f4f4f5;
    color: #606266;
    outline: none;
    border-radius: 2px;
    padding: 0 4px;
    vertical-align: top;
    display: inline-block;
    font-size: 13px;
    min-width: 35.5px;
    height: 28px;
    line-height: 28px;
    cursor: pointer;
    box-sizing: border-box;
    text-align: center;
    border: 0;

    &[disabled] {
      color: #c0c4cc;
      cursor: not-allowed;
    }

    &.active {
      cursor: not-allowed;
      background-color: #bfa;
      color: #fff;
    }
  }
}
</style>